/*
 * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#include <stdio.h>
#include <string.h>
#include <jvmti.h>

#ifdef __cplusplus
extern "C" {
#endif

static jvmtiEnv *jvmti = NULL;

JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
  int err = (*jvm)->GetEnv(jvm, (void**) &jvmti, JVMTI_VERSION_9);
  if (err != JNI_OK) {
    return JNI_ERR;
  }
  return JNI_OK;
}

JNIEXPORT jstring JNICALL
Java_GetBootClassPathAppendProp_getSystemProperty(JNIEnv *env, jclass cls) {
  jvmtiError err;
  char* prop_value;

  err = (*jvmti)->GetSystemProperty(jvmti, "jdk.boot.class.path.append", &prop_value);
  if (err == JVMTI_ERROR_NOT_AVAILABLE) {
    return NULL;
  }
  if (err != JVMTI_ERROR_NONE) {
    char err_msg[50];
    snprintf(err_msg, 50, "Wrong JVM TI error code: %d", err);
    return (*env)->NewStringUTF(env, err_msg);
  }

  return (*env)->NewStringUTF(env, prop_value);
}

#ifdef __cplusplus
}
#endif
